Brand New Aluminum Pulley kit. This kit will work on 1969-85 small block Chevy 283-350 with a "LONG" water pump. Our kit includes (1) Double Groove Water Pump Pulley. This water pump pulley is 6.60 inch diameter, 3 inch tall with a bolt circle of 2.25 inch. (1) Triple Groove Crankshaft Pulley. This crankshaft pulley is 6.60 inch diameter and 2-3/4 inch tall. Perfect for your off road, rock crawler, muscle car, street rod, Hot Rod, Rat Rod, Gasser, dune buggy, or sand rail project.